OpenWrt – Rev 1
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From cfcb2cc358f3ff466d4c419d8f6fe0263bdc47b1 Mon Sep 17 00:00:00 2001
From: Sean Wang <sean.wang@mediatek.com>
Date: Wed, 10 Jan 2018 00:28:24 +0800
Subject: [PATCH 194/224] pinctrl: mediatek: mt7622: fix potential
uninitialized value being returned
commit d6ed93551320 ("pinctrl: mediatek: add pinctrl driver for MT7622
SoC") leads to the following static checker warning:
drivers/pinctrl/mediatek/pinctrl-mt7622.c:1419 mtk_gpio_get()
error: uninitialized symbol 'value'.
1412 static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
1413 {
1414 struct mtk_pinctrl *hw = dev_get_drvdata(chip->parent);
1415 int value;
1416
1417 mtk_hw_get_value(hw, gpio, PINCTRL_PIN_REG_DI, &value);
^^^^^^^^^^^^^^^^
1418
1419 return !!value;
1420 }
The appropriate error handling must be added to avoid the potential error
caused by uninitialized value being returned.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
drivers/pinctrl/mediatek/pinctrl-mt7622.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/pinctrl/mediatek/pinctrl-mt7622.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
@@ -1412,9 +1412,11 @@ static struct pinctrl_desc mtk_desc = {
static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
{
struct mtk_pinctrl *hw = dev_get_drvdata(chip->parent);
- int value;
+ int value, err;
- mtk_hw_get_value(hw, gpio, PINCTRL_PIN_REG_DI, &value);
+ err = mtk_hw_get_value(hw, gpio, PINCTRL_PIN_REG_DI, &value);
+ if (err)
+ return err;
return !!value;
}